INTERACTION BETWEEN N-2 AND DIMERIZATION OF THE ZNSE SURFACE

The interaction between excited N-2 molecules and dimers at a stabiliz ed ZnSe(100) surface has been studied theoretically. The dimerization at the surface is treated as the one-dimensional lattice distortion, t he so-called Peierls transition, and the stability of the dimerization interacting with the excited N-2 molecules is evaluated within the me an field approximation. When the orbital energy in the N-2 molecule ge ts close to the chemical potential of the one-dimensional electron gas , the dimerization is not a preferable state, consistent with the N-2 adsorption and dissociation mechanism on a ZnSe surface we proposed us ing the cluster model (T. Nakao, T. Uenoyama, Jpn. J. Phys., 32 ( 1993 ) 660).